Quick Answer
To prevent water pooling around ground-mounted solar arrays, a proper drainage system should be implemented, typically by installing a slight slope to the array, and using a gravel or aggregate base under the mounting system. This helps to direct water away from the panels and prevent damage. Drainage channels can also be added to collect and redirect water.
Sloping the Array
A slight slope to the ground-mounted solar array can be achieved by designing the mounting system to have a minimum 2% pitch. This allows water to run off the panels and prevents it from accumulating around the array. A 2% pitch translates to 2 inches of rise per 10 feet of run. This slope can be achieved by using adjustable mounting brackets or by designing a custom mounting system.
Drainage Base and Channels
Using a gravel or aggregate base under the mounting system can help to direct water away from the panels. A 2-3 inch layer of compacted gravel or aggregate is typically sufficient to provide adequate drainage. Drainage channels can be installed around the perimeter of the array to collect and redirect water. These channels should be sloped to direct water away from the array and into a collection point, where it can be safely discharged.
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